[clang] [clang-tools-extra] [analyzer] Remove alpha.core.IdenticalExpr Checker (PR #114715)

[Congcong Cai via cfe-commits]

https://github.com/HerrCai0907 commented:

looks good. it extends the checker in clang-tidy so i think documents and releasenote in clang-tidy are also needed

https://github.com/llvm/llvm-project/pull/114715